Table 3.

Summary of soil properties for both calibration and independent validation set for spectral archetypes subspaces.

			Calibration						Validation
Subspace	Variable	Units	n	Min	Max	Mean	s.d	%CV	n	Min	Max	Mean	s.d	%CV
Archetype1
	Clay	%	292	2.22	97.3	52.7	21.5	40.8	86	2.22	88.03	42.2	23.9	56.6
	m3.Al	ppm	292	34	1434	649.7	267.1	41.1	86	47.39	1386	700.4	277.2	39.6
	m3.Ca	ppm	292	514	20,593.1	5533.2	4396.3	79.5	86	629.8	20,593.1	5201.7	5234.7	100.6
	pH	–	292	3.61	9.27	7.6	0.9	11.8	86	5.69	8.59	7.4	0.8	10.8
	Sand	%	292	1.38	96.06	30	22.5	75.0	86	2.56	96.06	40.4	29.4	72.8
	Totalcarbon	%	292	0.19	8.07	1.3	1.1	84.6	86	0.25	8.07	1.5	1.4	93.3
Archetype2
	Clay	%	393	0.32	74.35	23.6	12.3	52.1	171	0.32	50.43	20.1	11.5	57.2
	m3.Al	ppm	393	106	1660	539.2	225.6	41.8	171	138	1037	520.8	185.7	35.7
	m3.Ca	ppm	393	29.26	3696	533.1	465.3	87.3	171	130.6	3696	634.3	456.7	72.0
	pH	–	393	4.32	8.78	6.1	0.7	11.5	171	4.32	8.16	6.3	0.6	9.5
	Sand	%	393	7.87	99.68	58.6	19.4	33.1	171	15.86	99.68	64.5	18.9	29.3
	Totalcarbon	%	393	0.11	2.92	0.6	0.4	66.7	171	0.11	2.42	0.6	0.3	50.0
Archetype3
	Clay	%	29	23.76	80.86	51.4	18.2	35.4	20	32.98	80.86	57.5	16.5	28.7
	m3.Al	ppm	29	1.67	419	149.4	136.5	91.4	20	1.67	322.4	165	121.7	73.8
	m3.Ca	ppm	29	6540	35,200	17,824.7	8549.2	48.0	20	8377	34,460	17,299.3	7769.9	44.9
	pH	–	29	7.71	8.86	8.3	0.3	3.6	20	7.81	8.52	8.2	0.2	2.4
	Sand	%	29	2.25	59.16	20.3	14.9	73.4	20	2.25	40.41	14.3	10.9	76.2
	Total carbon	%	29	1.12	11.29	5.8	2.5	43.1	20	3.84	11.29	6.5	2.3	35.4
Archetype4
	Clay	%	615	1.55	99.27	53.9	21.7	40.3	299	1.55	93.15	49	23.3	47.6
	m3.Al	ppm	615	345.8	3041	1201.8	433.2	36.0	299	485.1	3041	1286.2	500.9	38.9
	m3.Ca	ppm	615	63	8550	987.7	997.9	101.0	299	109	6085.98	1061.3	1018	95.9
	pH	–	615	3.94	8.29	5.7	0.7	12.3	299	4.55	8.07	5.9	0.6	10.2
	Sand	%	615	0.12	97.83	27.7	21.5	77.6	299	1.31	97.83	34.1	25.5	74.8
	Totalcarbon	%	615	0.11	7.4	1.7	1.4	82.4	299	0.24	7.09	1.4	1.3	92.9